Improvement in saws



UNITED STATES PATENT OFFICE.,

f WILLIAM cLEMson, or MIDDLETOWRNEW YORK.

IMPROVEMENT |N sAws.

Specification forming part of Letters Patent N0. 57,088, dated August 14, 1866.

To all whom 'it may concernf Be it known that I, WILLIAM GLEMsoN, of Middletowmin the county of Orange and State of New York, Yhave invented a new and Improved Mode of Securing Teeth in Circular Saws; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawings, forming part or" this specification, in whichresults are obtained: first, theready removal of the teeth from the saw-plate, aswell as the ready attaching of them thereto; second, the

` I preventing of the swelling or warping ot the plate by the lateral pressure of the clamp which secures the teeth in the plate.`

A represents a portion of the plate of a circular saw, and B a recess made in said portion of the plate to receive the shank or tang a of the tooth G. This recess B" is cut or formed radially in the plate from its edge inward, and has parallel or about parallel sides b b', and an inner edge composed of three surfaces, c c c', so as to avoid sharp angles, the angles formed by said surfaces being obtuse.

The tooth C' may be oi' the usual or any proper form, and is provided with the shank or tang a, which corresponds in form to the I recess B, and has grooves d made in its sides which forms a portion ot a circle,| and has a projection, g, on its edge corresponding to the projectioneon the sides and end of the recess B.

The strip E, between the slot f in the shank or tang and the recess D, forms a spring, the use, of which "will be presently shown.

In the plate A, at the side of the recess B, there is made a recess, F, which forms rather more than half a circle, and which, With the recess D, makes a complete circle, F being in line or coinciding with D, as shown clearlyin Fig. l, and having a projection, h, extending around its edge.

Gris a clamp or plate, which forms a portion of a circle corresponding to the recess D, and of such dimensions that it may iit within D and turn therein, the periphery on edge of G having a groove extending all around its edge to receive the projection 1L of Fand the projection g of D.

In order to secure thetooth in the saw-plate A, the plate or clamp Gr is turned around in the recess'F, so as tol coincide Vwith it and not project at all within the recess B. This admits of the shank or tang a being inserted within the recess B, and when this is accomplished the plate or clamp G is turned so as to iit Within the recess D in .the shank or tang, the turning of the plate or tang being effected byinserting a lever in a hole, i, made in it.

It will be seen from the above description that the plate or clamp G prevents the shank or tang a from passing longitudinally out from the recess B, and the elastic strip or spring E prevents the saw-plate from warping or buckling under lateral pressure of the clamp, which is necessary in order to secure firmly the tooth in thesaW-plate'; and, besides this important result, the spring E prevents the clamp from Working loosea contingency which Would `otherwise be likely to occur in consequence of the rigidity oi' the metal surfaces in con tact.

l would remark `that the spring or elastic strip E, with slot f, may be advantageously used With rivets for securing the Ateeth in the saw-plate, and that one or more of said slots and elastic strips `may be employed in connection with each tooth.

Having thus described myinvention, I claim 2. The plate or clamp Gr, fitted in the recess as new and desire t0 secure by Letters Pat- Fin the saw-plate, in connection with the reentcess D in the shank or talug` a, substantially l. The slots f, one or more, made in the as and for the purpose set forth.

Shanks or tangs of the teeth, or in the sawplate, or both, and having such a relative po sition with the rivets, clamps, or astenings as to form springs or elastic strips E, to bear Witnesses:

0r bind against the rivets, clamps, or fasten- WM. F. MCNAMARA,

ings with an elastic or yielding pressure, sub- O. L. TOPLIFF.

stantially as described.

WM. GLEMSON. 

